键盘隐藏了IOS中的文本字段

Question

我在IOS中使用带有一些文本字段的scrollview创建了一个表单.视图看起来像这样,

当我开始编辑州或以下字段时,键盘会隐藏该字段.像这样,

我该怎么做才能看到以下字段(即状态和下方)？

Answer 1

你可以试试这个代码

在 viewcontroller.m 文件顶部添加以下代码

static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3;
static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2;
static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8;
static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216;
static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162;
CGFloat animatedDistance;

内部 textFieldShouldBeginEditing

 -(BOOL) textFieldShouldBeginEditing:(UITextField*)textField
 {    
     CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField];
    CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view];
    CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
    CGFloat numerator =  midline - viewRect.origin.y  - MINIMUM_SCROLL_FRACTION * viewRect.size.height;
    CGFloat denominator = (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)
    * viewRect.size.height;
    CGFloat heightFraction = numerator / denominator;
    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }  
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }
    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
   if (orientation == UIInterfaceOrientationPortrait ||
    orientation == UIInterfaceOrientationPortraitUpsideDown)
   {
        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
   }
   else
   {
       animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
   }
   CGRect viewFrame = self.view.frame;
   viewFrame.origin.y -= animatedDistance;

   [UIView beginAnimations:nil context:NULL];
   [UIView setAnimationBeginsFromCurrentState:YES];
   [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];
   [self.view setFrame:viewFrame];
   [UIView commitAnimations];
   return YES;

}

内部 textFieldShouldEndEditing

- (BOOL) textFieldShouldEndEditing:(UITextField*)textField
{
     CGRect viewFrame = self.view.frame;
     viewFrame.origin.y += animatedDistance;    
     [UIView beginAnimations:nil context:NULL];
     [UIView setAnimationBeginsFromCurrentState:YES];
     [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];    
     [self.view setFrame:viewFrame];
     [UIView commitAnimations];
}